Galvanized steel sheet for air conditioner ventilation opening

Abstract

The invention discloses a galvanized steel sheet for indoor building materials, such as an air conditioner ventilation opening and the like. The galvanized steel sheet is obtained by improving on the basis of Galfan. The excellent processability, weldability and the like of an original Galfan product are kept; the corrosion resistance is improved; particularly the surface appearance, the smooth finish, the planeness and the black change resistance of the steel sheet are improved; the application of the galvanized steel sheet to the indoor building materials, such as the air conditioner ventilation opening and the like is widened; and at the same time, the galvanized steel sheet belongs to the products contributing to environmental protection, because the galvanized steel sheet does not need chromate treatment.

Description

technical field [0001] The invention relates to a galvanized steel sheet with excellent smooth and smooth properties suitable for use in the field of building materials, in particular to a galvanized steel sheet used for air-conditioning vents. Background technique [0002] Due to its good corrosion resistance and low cost, galvanized steel sheets have been widely used in various fields such as building materials, home appliances, and automobiles. However, the corrosion resistance of pure galvanized steel sheets is not as good as that of steel sheets containing a certain amount of aluminum in the coating, so a series of steel sheets with galvanized aluminum coatings have been developed on the basis of galvanized steel sheets. Among them, Galfan, which is patented by the International Lead and Zinc Organization, is a typical product with excellent corrosion resistance and processing type. Galfan's alloy coating is composed of 95% Zn, 5% Al and traces of rare earths. However...

AI Technical Summary

Problems solved by technology

However, there are still some problems with Galfan galvanized steel sheets: for example, due to the uneven spangles produced on the surface of the steel sheet when the coating is solidified, it is seriously hindered from being used for interior decoration building materials that have higher requirements for smoothness and appearance; another example , the Galfan process often undergoes chromate treatment, and chromate treatment not only causes environmental pollution and is incompatible with the current environmental protection concept, but also the surface of the treated coating tends to be partially blackened over time. It also deteriorates its cleanliness and aesthetics

[0003] Although a lot of research has been done on the coating composition and content of Galfan galvanized steel sheets, it mainly focuses on improving the corrosion resistance of the coating and reducing the thickness of the coating. For example, Chinese patent application CN101396886A discloses a galvanized aluminum steel sheet, It is to improve on the basis of the existing plating solution composition, and invent a new galvanized steel sheet with excellent corrosion resistance, but it does not solve the original problems of spangles, smoothness, and appearance.